electromagnetic tawg yog dab tsi? Dab tsi yog electromagnetic yoj?
electromagnetic tawg yog dab tsi?
Ib qho alternating electric teb generates ib alternating magnetic teb, uas nyob rau hauv lem ua rau ib tug alternating hluav taws xob teb. Qhov ntawd yog hais tias, tsuav yog muaj ib qho chaw hloov hluav taws xob nyob rau hauv qhov chaw, ib qho tshiab alternating magnetic teb yuav raug generated nyob ib ncig ntawm nws, thiab qhov tshiab alternating magnetic teb no yuav excite ib alternating hluav taws xob teb nyob rau hauv qhov kev ncua deb. Qhov no alternating hluav taws xob thiab magnetic teb yog hu ua electromagnetic teb. Qhov kev hloov hluav taws xob sib txawv no yuav nthuav tawm hauv qhov chaw hauv ib daim ntawv zoo ib yam li dej nthwv dej, los ntawm ze mus rau deb, uas yog hu ua electromagnetic waves.
Lub phenomenon ntawm electromagnetic nthwv dej tau tawm mus rau hauv huab cua yog hu ua electromagnetic radiation. Hauv kev tiv thaiv ib puag ncig, hluav taws xob hluav taws xob feem ntau yog hais txog peb lub cev tshwm sim lossis ntau: hluav taws xob lub zog, lub zog hlau nplaum, thiab xov tooj cua cuam tshuam.
Dab tsi yog electromagnetic yoj?
Muaj ob qhov chaw tseem ceeb ntawm hluav taws xob hluav taws xob (electromagnetic field):
(1) Ntuj phenomena xws li lub teeb, xob laim, thiab geomagnetic teb yog electromagnetic phenomena nyob rau hauv cov xwm;
(2) Artificial (los ntawm kev hloov hluav taws xob hluav taws xob) tuaj yeem muab faib ua ob hom: lub zog hluav taws xob zaus hluav taws xob, hluav taws xob sib nqus, thiab xov tooj cua zaus electromagnetic.
Kev tsim hluav taws xob zaus hluav taws xob thiab cov hlau nplaum tuaj yeem muab faib ua ob qhov xwm txheej:
Cov khoom lag luam xws li TV xim, tub yees, tshuab ntxhua khaub ncaws, khoos phis tawj, tshuab luam ntawv, tshuab hluav taws xob, tshuab ntxhua khaub ncaws, tshuab hluav taws xob, hluav taws xob ncu, tshuab ziab khaub ncaws, cua sov, cua txias, lub tso suab receivers, lub tshuab nqus tsev vacuum, hluav taws xob qhov cub, thiab lub teeb yog lub ntsiab ntawm fais fab zaus electromagnetic teb nyob rau hauv tsev thiab chaw ua hauj lwm; High voltage kis kab, substations thiab hluav taws xob locomotives, lub teeb rail, maglev, thiab lwm yam yog lub ntsiab qhov chaw ntawm lub hwj chim zaus electromagnetic teb nyob rau hauv pej xeem ib puag ncig.
Ib qho hluav taws xob muaj peev xwm tsim tau xov tooj cua zaus electromagnetic teb nrog ntau dua 100KHz. Cov khoom siv hluav taws xob muaj xws li xov tooj cua thiab xov tooj cua xa xov tooj cua, radars, xov tooj ntawm tes thiab chaw nres tsheb hauv paus, chaw nres tsheb hauv ntiaj teb, chaw nres tsheb microwave, microwave ncu, hluav taws xob tiv thaiv tub sab tub nyiag, thiab lwm yam. Cov no yog tag nrho RF electromagnetic teb emission qhov chaw uas tuaj yeem pom txhua qhov chaw hauv peb ib puag ncig txhua hnub.
Xov tooj cua hluav taws xob hluav taws xob hluav taws xob tuaj yeem muab faib ua cov pawg hauv qab no raws li kev ua haujlwm ntawm cov khoom siv hluav taws xob hluav taws xob hluav taws xob hluav taws xob nyob hauv ib puag ncig pej xeem:
(1) Cov khoom siv tshaj tawm thiab xov tooj cua kis tau tus mob?
Cov yoj yoj luv luv, nruab nrab yoj tshaj tawm, kev tshaj tawm suab nrov, kev tshaj tawm hauv xov tooj cua, thiab lwm yam. Lub tuam tsev tseem ceeb yog tshaj tawm thiab TV hauv ntau thaj tsam
(2) Kev sib txuas lus, radar, thiab navigation kis khoom siv
Kev sib txuas lus yog kev lag luam loj tshaj plaws hauv Suav teb, tshwj xeeb tshaj yog kev sib txuas lus mobile. Cov pawg no suav nrog cov chaw nres tsheb luv luv, chaw nres tsheb sib txuas lus microwave, chaw nres tsheb sib txuas lus hauv av, chaw nres tsheb sib txuas lus hauv xov tooj, cov vev xaib kev sib txuas lus, kev sib txuas lus hauv paus chaw nres tsheb, ntau yam khoom siv radar thiab cov khoom siv navigation, thiab lwm yam.
Radar thiab navigation feem ntau yog kev taw qhia thiab tsis tu ncua, thiab cov teeb liab kis tau los ntawm cov kav hlau txais xov.
Vim yog kev tshaj tawm xov xwm tsis raug, nyob rau xyoo tas los no, feem coob ntawm cov xov tooj cua hluav taws xob hluav taws xob hluav taws xob tsis sib haum xeeb ntawm cov neeg nyob hauv nroog thiab cov neeg nyob deb nroog tau raug coj mus rau cov chaw nres tsheb sib txuas lus mobile.
